- If the recipient fails to express one or more of the primary KIR ligands (HLA-C group I, HLA-C group II, and Bw4) then family member donors will be HLA typed in an effort to find a haploidentical donor. If multiple haploidentical donors are available, KIR phenotyping will be performed in Dr. van Rhee's research laboratory to select a KIR mismatched donor whenever possible.